import React,{useMemo,useState} from 'react'

export default function App() {
    const [count,setCount]=useState(0);
    const [value,setValue]=useState('');
    const treatCount=useMemo(()=>{
        console.log('treatCount');
        return count+10;
    },[count])
  return (
    <div>
      treatCount:{treatCount} <br/>
      count:{count}<button onClick={()=>setCount(count+1)}>点击</button>
      <br />
      <input 
        type="text"
        value={value}
        onInput={(e)=>{
            setValue(e.target.value);
        }}
      />
    </div>
  )
}
